More stories about Testing

We're supplying concrete for a tilt-up project that requires concrete with a 3500-psi (25 MPa) 28-day compressive strength. In addition to making standard test cylinders, the tilt-up contractor is also making beams that are stored in the field before they're tested. Because of nonstandard curing...

We recently supplied controlled low-strength material (CLSM) for backfill. Specifications called for a maximum 28-day compressive strength of 200 psi to allow excavation by backhoe at a later date. We designed for a strength between 50 and 150 psi, but cylinder breaks indicated compressive...